No wires, no worries and no more excuses for being late. The 1600E synchronizes to the US Atomic Clock providing the most precise and accurate time. Tru-Align™ feature ensures a perfect punch everytime on special E16 time cards (sold separately). The 1600E is truly automatic as it never needs resetting because it automatically changes year, month and date with perpetual calendar until Year 2099. Even changes time automatically for daylight saving time. With a five-year memory backup battery, the 1600E will even keep time and settings during power outages. As a time clock, the 1600E records employees' in and out times for payroll accounting. As a job clock it can track project time for accurate costing. As a document stamp, the 1600E can print the date, time and preset messages on important documents. Time Clock Type: Electronic; Number of Employees: Unlimited; Imprint Style: 18 Preset Formats; Minute Increments: Minute.